Restrictions on the Use of Datatypes

SourcePro : DB Access Module for PostgreSQL User’s Guide : Technical Information : Datatypes : Restrictions on the Use of Datatypes

The PostgreSQL database places restrictions on the use of certain datatypes. Where possible, the DB Interface Module is flexible about datatypes. However, there are some situations where conversions are not possible. In these cases your applications must be aware of the contexts in which certain datatypes can be used. Table 3 outlines the known restrictions associated with each DB Interface Module type.

Table 3 – Restrictions on the use of DB Interface Module datatypes
RWDBValue::ValueType	Restrictions
Blob	No restrictions
Char UnsignedChar	No restrictions
Date	Only the PostgreSQL DateStyle ISO, MDY is supported.
DateTime	RWDateTime is limited to milliseconds, but PostgreSQL can support a much finer precision. PostgreSQL's timestamp type supports a range from 4713 BC to 5874897 AD. However, RWDateTime is limited to a datetime range of 09-14-1752 00:00:00.000 to 9999-12-31 23:59:59.999 Only the PostgreSQL DateStyle ISO 8601 format in MDY mode is supported.
TimeTuple	Only the PostgreSQL DateStyle ISO 8601 format in MDY mode is supported.
TimeTupleOffset	This datatype is not supported.
Decimal	No restrictions
Double	No restrictions
Duration	No restrictions
Float	No restrictions
Int UnsignedInt	No restrictions
Long UnsignedLong	No restrictions
MBString	This datatype is not supported.
LongLong UnsignedLongLong	No restrictions
LongDouble	No restrictions
String	No restrictions
Short UnsignedShort	No restrictions
WString	This datatype is not supported.
UString	This datatype is not supported.